2015/9/22 4 Seismic checking for pile foundation(selected) eaon 1)the investigation of .Semic checking for pll foundain(sleced) 4)A2015/9/22 5 2. 4 Seismic checking for pile foundation *** (selected) 2. Seismic concept design for pile foundation In some satiation that bearing capacity of pile foundation and its subsoil need not be checked for earthquake resistance. Reasons: 1）the investigation of earthquake damages show that, the bearing capacities of pile foundations were much better than those of natural foundations. 2) the strength of soil is higher under dynamic loads than under static loads. 2015/9/22 熊海贝，同济大学土木工程学院 xionghaibei@tongji.edu.cn 25 2. 4 Seismic checking for pile foundation *** (selected) 2015/9/22 熊海贝，同济大学土木工程学院 xionghaibei@tongji.edu.cn 26 (1) pile foundations, with lower pile cup and mainly supported vertical loads, (2) soils: bearing subsoil is no liquefaction, and no silt surrounding the cushion (pile caps) (3) Some structures, of which seismic checking NEED NOT be conducted for their superstructures,specified in the code. (4) And structures, which seismic fortification are 7 and 8, • ordinary single-story factory buildings, and single-story spacious buildings, • multi-storey framed civil buildings, w hich storey is less than 8 storey or height is less than 24m, • Or similar w orkshops and multi-storey shear-wall structures. 2. Requirements for Needn't Checking: 2015/9/22 熊海贝，同济大学土木工程学院 xionghaibei@tongji.edu.cn 27 Q: How to analyze the load distribution of the soil and pile foundation ? Q: How to check the pile foundations’ capacities? 2. 4 Seismic checking for pile foundation *** (selected) 2015/9/22 熊海贝，同济大学土木工程学院 xionghaibei@tongji.edu.cn 28