Frequency: Quarterly E- ISSN: 2250-2955 P- ISSN: Awaited Abstracted/ Indexed in: Ulrich's International Periodical Directory, Google Scholar, SCIRUS, Genamics JournalSeek, EBSCO Information Services
Quarterly published in print and online "Inventi Impact: Civil Engineering" publishes high quality unpublished as well as high impact pre-published research and reviews catering to the needs of researchers and professional engineers. The journal deals with multidimensional aspects of civil engineering including Coastal and Harbor Engineering, Construction Management, Environmental Engineering, Geotechnical Engineering, Highway Engineering, Railroad Engineering, Structural Engineering, Surveying and Geo-Spatial Engineering, Tunnel Engineering etc.
In the IBS building maintenance, the conventional methods to the project delivery and its failure to form\neffective communication channel between complementary knowledge on IBS construction and related members that\nis conducted in the sequential manner has resulted in ineffectiveness for managing building maintenance, where a\nparadigm shift within the IBS traditional approach is necessary. The research results described are concerned with i)\nan integrated system to record, diagnose and analyse information for IBS building maintenance to detect patent or\nlatent defect, select an effective repair method, provide appropriate planning decision and reduce risks of defect\nthroughout the building lifetime. ii) building a decision making support in diagnosis in IBS building maintenance\nbased on robust data collection about concrete defects and causes including in the selection of a durable replacement\ndesign and material or the proper rehabilitation method. The system development was based on analysis of number of\ninterviews and case studies conducted with professional engineers working in IBS building maintenance departments.\nThe paper concludes that implementing a CMMS Expert using BIM can help improve the performance of IBS\nbuilding design, construction and maintenance operations....
This paper presents a new adaptive pushover procedure to account for the effect of higher modes in order to accurately estimate the\r\nseismic response of bridges. The effect of higher modes is considered by introducing a minimum value for the total effective modal\r\nmass. The proposed method employs enough number of modes to ensure that the defined total effective modal mass participates\r\nin all increments of the pushover loading. An adaptive demand curve is also developed for assessment of the seismic demand. The\r\nefficiency and robustness of the proposed method are demonstrated by conducting a parametric study. The analysis includes 18\r\nfour-span integral bridges with various heights of piers. The inelastic response history analysis is employed as reference solution in\r\nthis study. Numerical results indicate excellent accuracy of the proposed method in assessment of the seismic response. For most\r\nbridges investigated in this study, the difference between the estimated response of the proposed method and the inelastic response\r\nhistory analysis is less than 25% for displacements and 10% for internal forces. This indicates a very good accuracy compared\r\nto available pushover procedures in the literature. The proposed method is therefore recommended to be applied to the seismic\r\nperformance evaluation of integral bridges for engineering applications....
Transverse opening in a beam has a reducing effect of the beam stiffness which will cause a significant\nincrease in beam deflection in the region on the opening. In this paper, a new stiffness\nmatrix for a beam element with transverse opening including the effect of shear deformation has\nbeen derived. The strain energy principle is used in the derivation process of the stiffness matrix\nand the fixed-end force vector for the case of a concentrated or a uniformly distributed load is also\nderived. The accuracy of the obtained results based on the derived stiffness matrix is examined\nthrough comparison with that of the finite element method using Abaqus package and a previous\nstudy which show a good agreement with high accuracy....
Retaining walls are critical geotechnical assets and their performance needs to be monitored\nin accordance to transportation asset management principles. Current practices for retaining wall\nmonitoring consist mostly of qualitative approaches that provide limited engineering information or\nthe methods include traditional geodetic surveying, which may provide high accuracy and reliability,\nbut is costly and time-consuming. This study focuses on evaluating failure modes of a 2.43 m Ã?â?? 2.43 m\nretaining wall model using three-dimensional (3D) photogrammetry as a cost-effective quantitative\nalternative for retaining wall monitoring. As a remote sensing technique, photogrammetry integrates\nimages collected from a camera and creates a 3D model from the measured data points commonly\nreferred to as a point cloud. The results from this photogrammetric approach were compared to ground\ncontrol points surveyed with a total station. The analysis indicates that the accuracy of the displacement\nmeasurements between the traditional total station survey and photogrammetry were within 1ââ?¬â??3 cm.\nThe results are encouraging for the adoption of photogrammetry as a cost-effective monitoring tool\nfor the observation of spatial changes and failure modes for retaining wall condition assessment....
The deformation rules and failure types of rock fatigue damage at different temperatures are quite different, and existing\nconstitutive theory cannot describe them quantitatively. A novel rock fatigue damage model considering the effects of temperature\nwas presented based on phenomenology. In this model, the residual strain method was used to define the fatigue damage, and the\nHarris attenuation function was introduced to characterize the cyclic damage evolution. The proposed model has considered the\ninfluence of the initial damage and temperature, and the model parameters can be easily calculated. The accuracy of the model was\nverified by comparing the calculated values of cyclic upper strain and fatigue life with previous test results. The physical significance\nof the model parameters shows that parameter a is related to fatigue stress ratio and lithology, while parameter b is\nrelated to temperature. The study has some reference values for the fatigue damage model of rock considering the influence\nof temperature....
Knowledge of the tensile Youngââ?¬â?¢s modulus of concrete at early ages is important for estimating the risk of cracking due to restrained\r\nshrinkage and thermal contraction. However, most often, the tensile modulus is considered equal to the compressive modulus and\r\nis estimated empirically based on the measurements of compressive strength. To evaluate the validity of this approach, the tensile\r\nYoungââ?¬â?¢s moduli of 6 concrete and mortar mixtures are measured using a direct tension test. The results show that the tensile\r\nmoduli are approximately 1.0ââ?¬â??1.3-times larger than the compressive moduli within the materialââ?¬â?¢s first week of age. To enable\r\na direct estimation of the tensile modulus of concrete, a simple three-phase composite model is developed based on random\r\ndistributions of coarse aggregate, mortar, and air void phases. The model predictions show good agreement with experimental\r\nmeasurements of tensile modulus at early age....
In China, there�s high energy consumption in buildings with less attention to building energy efficiency.\nAll of these facts prove that there are great potentialities in energy conservation. On account\nof this, this paper introduces multiple building energy-saving technologies at home and\nabroad, including the technologies for innovative wall materials, exterior wall external insulation,\nheat insulation of window, utilization of solar energy, heat storage and recovery as well as the illumination\nenergy saving technology. On the basis of new buildings, this paper gives five suggestions\non building energy efficiency. Meanwhile it raises five suggestions on energy conservation\nbased on the existing building, for which it presents purposely the technologies and measures\nabout energy saving transformation from four aspects....
Possible base sliding induced by an earthquake on concrete gravity dams is obtained by a simplified procedure. The model is a nonlinear single-degree-of-freedom system which takes into account dam-water-foundation interaction based on the model developed by Fenves and Chopra (1987). The nonlinearity is in the foundation rock, since a threshold value for the sliding foundation resistance, modeled with the Mohr-Coulomb yielding criterion including a frictional and a cohesive component, is imposed. Nonlinear step by dams is obtained by a simplified procedure. The model is a nonlinear single-degree-of-freedom system which takes into account dam-water-foundation interaction based on the model developed by Fenves and Chopra (1987). The nonlinearity is in the foundation rock, since a threshold value for the sliding foundation resistance, modeled with the Mohr-Coulomb yielding criterion including a frictional and a cohesive component, is imposed. Nonlinear step by step dynamic analyses are carried out on four case studies representing typical examples of Italian concrete gravity dams by utilizing several natural earthquakes. On the basis of the obtained results, a simplified methodology to estimate residual displacement without performing nonlinear dynamic analysis is presented. An example of application using as seismic input the elastic response spectra furnished by the Italian Code is also presented....
A large number of gas drainage pipes are obsoleted in the coal mine gas drainage system, and it causes serious waste. If concrete is poured into the discarded gas drainage pipes as components for underground roadway support, it is very significant for sustainable development of mine.Therefore, it is necessary to study the mechanical properties of the concrete-filled gas drainage steel pipe. Most frequently used gas drainage pipes are spiral welded steel pipe (SSP-I) and spiral external rib steel pipe (SSP-II). In this study, three different concrete-filled steel pipes are taken as the research object: SSP-I concrete-filled steel pipes, SSP-II concretefilled steel pipes, and RSP concrete-filled ordinary round steel pipes.Through the axial compression test, the failure mode and relationship between stress-strain of concrete-filled steel pipes were obtained. Subsequently, the ultimate bearing capacity of three types of specimens was calculated based on the unified strength theory, limit equilibrium theory, and superposition theory.The test results show that both the SSP-I concrete-filled pipe columns and RSP concrete-filled pipe have good post-peak load-bearing capacity and ductility, and the second peak load reaches 70.38% and 81.92% of the ultimate load, respectively.The load-bearing capacity of SSP-II concrete-filled pipe columns is dropped sharply after bearing ultimate load, and the second peak load reaches only 36.47% of the ultimate load.The failure characteristics of concrete-filled gas drainage pipe columns show that the core concrete is compressed to powder and explain that the gas drainage pipe has fully exerted its restraint on the concrete.The FE method was used to simulate the compression test of three types of concrete-filled steel pipes, and the numerical simulation results show good agreement with the experimental results.Theoretical calculations show that the calculation of concrete-filled gas drainage pipe columns based on the superposition theory EC4-2004 is the closest to the measured value.Therefore, the EC4-2004 standard is recommended to calculate the ultimate bearing capacity of concrete-filled gas drainage pipe columns....
To optimize the main components of reactive powder concrete (RPC) for various curing methods, based on the fluidity and\ncompressive strength, an inclusive experimental research is conducted on 58 different mixture ratios. The results indicate that\nowing to the increase of the cement strength, the RPC fluidity decreases and the cement strength is not proportional to the\ncompressive strength. The addition of the fly ash and the nano-microbead is an effective way to improve the fluidity, and it is\nrequired at the low W/B ratio. However, the influence of the SF grade on the strength and fluidity is almost negligible. By\nconsidering the fluidity, strength, and economy of RPC as crucial design factors, SF90 is suggested. The contribution of the steel\nfiber to the compressive strength cannot be ignored. The upper envelope value of the steel fibers is required for the structure to\nresist appropriately against the fire. According to the test results, the mixture ratio formula is proposed through considering the\ncharacters of different compositions and curing methods. The strength coefficient k1 is introduced to verify the influence of the\nsteel fiber content, and the parameters...............
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